Fix bind mount using relative path

env/mount_linux.go

@@ -3,6 +3,7 @@ package env
 import (
 	"fmt"
 	"io/ioutil"
+	"os"
 	"path"
 
 	"github.com/criyle/go-sandbox/pkg/mount"
@@ -44,14 +45,22 @@ func readMountConfig(p string) (*Mounts, error) {
 
 func parseMountConfig(m *Mounts) (*mount.Builder, error) {
 	b := mount.NewBuilder()
+	wd, err := os.Getwd()
+	if err != nil {
+		return nil, err
+	}
 	for _, mt := range m.Mount {
 		target := mt.Target
 		if path.IsAbs(target) {
 			target = path.Clean(target[1:])
 		}
+		source := mt.Source
+		if !path.IsAbs(source) {
+			source = path.Join(wd, source)
+		}
 		switch mt.Type {
 		case "bind":
-			b.WithBind(mt.Source, target, mt.Readonly)
+			b.WithBind(source, target, mt.Readonly)
 		case "tmpfs":
 			b.WithTmpfs(target, mt.Data)
 		default:

mount.yaml

@@ -47,10 +47,10 @@ mount:
   - type: tmpfs
     target: /tmp
     data: size=16m,nr_inodes=4k
-  # bind a /etc/passed to show customized user name
-  # - type: bind
-  #   source: /home/criyle/go-judge/containerPasswd.txt
-  #   target: /etc/passwd
+  # (optional) bind a /etc/passed to show customized user name
+  - type: bind
+    source: containerPasswd.txt
+    target: /etc/passwd
 # java & ghc wants /proc/self/exe
 proc: true
 # container work directory